Wikitude POI不会出现在Android上

我创建了一个Android Studio项目，并将Wikitude示例（Wikitude SDK 5.0）导入assets文件夹 . 我是JavaScript和Wikitude的新手，但我认为我能够获得GPS坐标，但没有POI出现 .

你们有没有在Android上使用Wikitude的经验？如何显示POI？官方文档无济于事 .

很抱歉有很长的源代码，但我现在已经停留了2天，无法找到任何好的解决方案:(感谢您的帮助！

POILOCATION.js：

// implementation of AR-Experience (aka "World")
var World = {
// true once data was fetched
initiallyLoadedData: false,



// POI-Marker asset
markerDrawable_idle: null,

// called to inject new POI data
loadPoisFromJsonData: function loadPoisFromJsonDataFn(poiData) {

    /*
        The example Image Recognition already explained how images are loaded and displayed in the augmented reality view. This sample loads an AR.ImageResource when the World variable was defined. It will be reused for each marker that we will create afterwards.
    */
    World.markerDrawable_idle = new AR.ImageResource("assets/marker_idle.png");

    /*
        For creating the marker a new object AR.GeoObject will be created at the specified geolocation. An AR.GeoObject connects one or more AR.GeoLocations with multiple AR.Drawables. The AR.Drawables can be defined for multiple targets. A target can be the camera, the radar or a direction indicator. Both the radar and direction indicators will be covered in more detail in later examples.
    */
    var markerLocation = new AR.GeoLocation(poiData.latitude, poiData.longitude, poiData.altitude);
    var markerImageDrawable_idle = new AR.ImageDrawable(World.markerDrawable_idle, 2.5, {
        zOrder: 0,
        opacity: 1.0
    });

    // create GeoObject
    var markerObject = new AR.GeoObject(markerLocation, {
        drawables: {
            cam: [markerImageDrawable_idle]
        }
    });

    // Updates status message as a user feedback that everything was loaded properly.
    World.updateStatusMessage('1 place loaded');
},

updateStatusMessage: function updateStatusMessageFn(message, isWarning) {
    var themeToUse = isWarning ? "e" : "c";
    var iconToUse = isWarning ? "alert" : "info";

    $("#status-message").html(message);
    $("#popupInfoButton").buttonMarkup({
        theme: themeToUse
    });
    $("#popupInfoButton").buttonMarkup({
        icon: iconToUse
    });
},

// location updates, fired every time you call architectView.setLocation() in native environment
locationChanged: function locationChangedFn(lat, lon, alt, acc) {
    if (!World.initiallyLoadedData) {
        // creates a poi object with a random location near the user's location
        var poiData = {
            "id": 1,
            "longitude": (lon + (Math.random() / 5 - 0.1)),
            "latitude": (lat + (Math.random() / 5 - 0.1)),
            "altitude": 100.0
        };

        World.loadPoisFromJsonData(poiData);
        World.initiallyLoadedData = true;
    }
},
};

/*  Set a custom function where location changes are forwarded to. There is     also a possibility to set AR.context.onLocationChanged to null. In this case the     function will not be called anymore and no further location updates will be     received. 
*/
//AR.context.onLocationChanged = World.locationChanged;
AR.context.onLocationChanged = locationChangedFn(lat, lon, alt, acc) {
    console.log("asdsadasdsadasasdadaello World");

                                if (!World.initiallyLoadedData) {
                                    // creates a poi object with a random location near the user's location
                                    var poiData = {
                                        "id": 1,
                                        "longitude": (lon + (Math.random() / 5 - 0.1)),
                                        "latitude": (lat + (Math.random() / 5 - 0.1)),
                                        "altitude": 100.0
                                    };
   world.markerDrawable_idle = new AR.ImageResource("assets/marker_idle.png");

                                        /*
                                            For creating the marker a new object AR.GeoObject will be created at the specified geolocation. An AR.GeoObject connects one or more AR.GeoLocations with multiple AR.Drawables. The AR.Drawables can be defined for multiple targets. A target can be the camera, the radar or a direction indicator. Both the radar and direction indicators will be covered in more detail in later examples.
                                        */
                                        var markerLocation = new AR.GeoLocation(poiData.latitude, poiData.longitude, poiData.altitude);
                                        var markerImageDrawable_idle = new AR.ImageDrawable(World.markerDrawable_idle, 2.5, {
                                            zOrder: 0,
                                            opacity: 1.0
                                        });

                                        // create GeoObject
                                        var markerObject = new AR.GeoObject(markerLocation, {
                                            drawables: {
                                                cam: [markerImageDrawable_idle]
                                            }
                                        });

                                        // Updates status message as a user feedback that everything was loaded properly.
  World.updateStatusMessage('1 place loaded');
        World.initiallyLoadedData = true;
}};